How many calories should a 45-year-old 120 lb woman eat to lose weight?

A 45-year-old 120 lb woman should eat approximately 1115 kcal/day to lose about 1 lb per week — a 500 kcal deficit from the maintenance estimate of 1615 kcal.

What is the BMI for a 120 lb woman?

At 120 lbs (54.4 kg) and average height (162.6 cm), the BMI is 20.6 — Healthy weight ✅.

Calorie Guide · Age 45 · 120 lbs

Calories for a 45-Year-Old 120 lb Woman

Q: How many calories does a 45-year-old 120 lb woman need?

A lightly active 45-year-old 120 lb woman of average height needs approximately 1615 kcal/day to maintain weight. This ranges from 1409 kcal (sedentary) to 2026 kcal (very active).

Exact BMR, TDEE and calorie targets for a 45-year-old woman weighing 120 lbs (54.4 kg).

Calorie Needs: 45 years old · 120 lbs · Woman

1175

BMR (at rest)

1409

Sedentary TDEE

1615
Lightly active TDEE

1821

Moderately active

1115

Weight loss target

1615

Maintenance

1915

Muscle gain target

How Many Calories Does a 45-Year-Old 120 lb Woman Need?

Using the Mifflin-St Jeor equation with your exact inputs — age 45, weight 120 lbs (54.4 kg), average woman's height (162.6 cm) — the resting metabolic rate is 1175 kcal/day. With typical daily activity, total calorie expenditure (TDEE) ranges from 1409 kcal (sedentary) to 2026 kcal (very active).

Age 45 note: After 40, hormonal changes further reduce metabolic rate. Sleep, stress management and strength training become increasingly important for body composition.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	865 kcal	~1.5 lbs/week
📉 Weight loss	1115 kcal	~1 lb/week
✅ Maintenance	1615 kcal	Weight stable
💪 Lean bulk	1915 kcal	~0.5 lbs/week
🏋️ Aggressive bulk	2115 kcal	~1 lb/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1409 kcal
Lightly active	1–3 workouts/week	1615 kcal
Moderately active	3–5 workouts/week	1821 kcal
Very active	Hard training 6–7 days/week	2026 kcal

BMI at 120 lbs

At 120 lbs (54.4 kg) and average height for a woman (162.6 cm), your BMI is 20.6 — Healthy weight ✅. BMI is a useful screening tool but doesn't measure body composition. Waist circumference and muscle mass provide additional context.

Macronutrient Split at 1615 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	121 g	484 kcal
Carbohydrates	40%	162 g	648 kcal
Fat	30%	54 g	486 kcal

For weight loss at 1115 kcal/day, increase protein to 35% (98 g/day) to preserve muscle during the deficit. At age 45, protein becomes increasingly important for maintaining metabolic rate.

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Frequently Asked Questions

How many calories should a 45-year-old 120 lb woman eat per day?A lightly active 45-year-old 120 lb woman needs approximately 1615 kcal/day to maintain weight. This ranges from 1409 kcal (sedentary) to 2026 kcal (very active).

How many calories to lose weight at 120 lbs, age 45?Eat 1115 kcal/day for a 500 kcal deficit — approximately 1 lb of fat loss per week. Recalculate your targets every 4–6 weeks as your weight changes.

Does age 45 significantly affect calorie needs vs age 40?At age 45, BMR is approximately 1175 kcal vs 1200 kcal at age 40 — a difference of 25 kcal/day. This is mainly driven by gradual muscle loss over time, which is largely preventable with resistance training.

Related Calorie Guides

Sources

Mifflin-St Jeor Equation (PubMed) CDC Healthy Weight WHO